- #1

Michael24

- 4

- 0

## Homework Statement

Air flows at a mass flow rate(m) of 0.05kg/s in a thin pipe with a diameter of 0.15m. The air enters the pipe at (T

_{i})103 deg celc and cools to(T

_{o}) 77 deg celc after traveling 5 m in the pipe. The heat transfer coefficient between the duct outer surface and the ambient air at T

_{amb}= 0 deg celc is h

_{o}= 6W/m

^{2}K.

Determine the heat flux(W/m

^{2}and the duct surface temperature at x = 5m. The duct wall is thin and conduction effect can be neglected.

## Homework Equations

q

^{''}[W/m

^{2}] ...Might need this equation ??

## The Attempt at a Solution

q [W] = mc

_{p}(T

_{i}-T

_{o}) = 1313 W where c

_{p}= 1010 J/KgK for air flowing through pipe.

If I'm not told that the surface heat flux is constant can I still apply the equation above? Also, without knowing surface conditions such as constant surface heat flux or constant surface temperature is this problem solvable?